Thursday, July 19, 2012 11:12:45 PM
13.3.1. SAMPLE CHARACHTERISTICS
Bulk samples, collected from two locations across the face of CWH (Cobbhead Hill) in the upstream part of the Chapin Wash, arrived at the start of 2011 in 25 steel drums, weighing about 7 t in total (Kemetco 2011). Three randomly selected drums were prepared for the test program: their contents were very consistent in grade and particle size assays. Typical blends of materials requiring size reduction contained approximately 50% mudstones and rocks up to 10" in size. Materials were crushed to top size of ?". Assays are compared in Table 13.2, showing that the three CWH (Cobbhead Hill) selected for batch testing were homogeneous in makeup. Random samples of MacGregor pit (MGP) material that were also tested showed higher grades of manganese, but otherwise very similar feldspar-dominated compositions.
Refer to Figure 13.1 which is the curve of recovery of manganese grading .0.2% to 0.5%
.This may help you understand better maybe clear up 2guys confusion
Blairman
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